package com.study.tests;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.thoughtworks.xstream.XStream;

public class ContactDataGenerator {

	public static void main(String[] args) throws IOException {
		if (args.length < 3) {
			System.out
					.println("Please specify parameters: <amoutn of test data> <file> <format>");
			return;
		}
		int amount = Integer.parseInt(args[0]);
		File file = new File(args[1]);
		String format = args[2];
		if (file.exists()) {
			System.out.println("File exists, please remove it manually:" + file);
			return;
		}
		List<ContactData> contacts = generateRandomContacts(amount);
		if ("csv".equals(format)) {
			saveContactsToCsvFile(contacts, file);
		} else if ("xml".equals(format)) {
			saveContactsToXmlFile(contacts, file);
		} else {
			System.out.println("Unknown format" + format);
			return;
		}
	}

	private static void saveContactsToXmlFile(List<ContactData> contacts,
			File file) throws IOException {
		XStream xstream = new XStream();
		xstream.alias("contact", ContactData.class);
		String xml = xstream.toXML(contacts);
		FileWriter writer = new FileWriter(file);
		writer.write(xml);
		writer.close();
	}

	public static List<ContactData> loadContactsFromXmlFile(File file) {
		XStream xstream = new XStream();
		xstream.alias("contact", ContactData.class);
		return (List<ContactData>) xstream.fromXML(file);
	}

	private static void saveContactsToCsvFile(List<ContactData> contacts,
			File file) throws IOException {
		FileWriter writer = new FileWriter(file);
		for (ContactData contact : contacts) {
			writer.write(contact.getFirstName() + "," + contact.getLastName() + "," + contact.getEmail1() + "," + contact.getEmail2() + ",!" + "\n");
		}
		writer.close();
	}

	public static List<ContactData> loadContactsFromCsvFile(File file)
			throws IOException {
		List<ContactData> list = new ArrayList<ContactData>();
		FileReader reader = new FileReader(file);
		BufferedReader bufferedReader = new BufferedReader(reader);
		String line = bufferedReader.readLine();
		while (line != null) {
			String[] part = line.split(",");
			ContactData contact = new ContactData()
			        .withFirstName(part[0])
					.withLastName(part[1])
					.withEmail1(part[2])
					.withEmail2(part[3]);
			list.add(contact);
			line = bufferedReader.readLine();
		}
		bufferedReader.close();
		return list;
	}

	public static List<ContactData> generateRandomContacts(int amount) {
		List<ContactData> list = new ArrayList<ContactData>();
		for (int i = 0; i < amount; i++) {
			ContactData contact = new ContactData()
					.withFirstName(generateContactRandomString())
					.withLastName(generateContactRandomString())
					.withEmail1(generateContactRandomString())
					.withEmail2(generateContactRandomString());
			list.add(contact);
		}
		return list;
	}

	public static String generateContactRandomString() {
		Random rnd = new Random();
		if (rnd.nextInt(10) == 0) {
			return "!null!";
		} else {
			return "test" + rnd.nextInt();
		}
	}

}